:root {
  --bg: #f5f7f8;
  --surface: #ffffff;
  --border: #dfe4e8;
  --text: #1c2733;
  --text-muted: #5b6b78;
  --primary: #1f6f5c;
  --primary-hover: #17594a;
  --danger: #b3261e;
  --danger-bg: #fbeae9;
  --success: #1f8a4c;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 30, 40, 0.06), 0 4px 12px rgba(20, 30, 40, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12181d;
    --surface: #1a2229;
    --border: #2b3640;
    --text: #e7edf1;
    --text-muted: #97a6b2;
    --primary: #4fb797;
    --primary-hover: #6bcaad;
    --danger: #ff8a80;
    --danger-bg: #3a1e1c;
    --success: #4fd18b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.4;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.app-header__title h1 {
  margin: 0;
  font-size: 1.25rem;
}

.app-header__subtitle {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.health-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  white-space: nowrap;
}

.health-badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.health-badge--ok .health-badge__dot { background: var(--success); }
.health-badge--ok .health-badge__label { color: var(--success); }
.health-badge--down .health-badge__dot { background: var(--danger); }
.health-badge--down .health-badge__label { color: var(--danger); }

.tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.75rem 1.5rem 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 600;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.tab[aria-selected="true"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.app-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

.panel[hidden] {
  display: none;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.card + .card {
  margin-top: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.field input {
  font: inherit;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}

.field input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.field-error {
  color: var(--danger);
  font-size: 0.8rem;
}

.form-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  flex-wrap: wrap;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
}

.btn:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn--secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.error-banner {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 0.9rem;
}

.results {
  margin-top: 1.25rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem;
  text-align: center;
}

.stat-card__label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-card__value {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.stat-card__unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.results-meta {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.date-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.date-chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.4rem 0.3rem 0.75rem;
  font-size: 0.85rem;
}

.date-chip button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  padding: 0.15rem 0.35rem;
  border-radius: 50%;
}

.date-chip button:hover {
  background: var(--border);
  color: var(--text);
}

.day-block {
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.day-block summary {
  cursor: pointer;
  padding: 0.75rem 1rem;
  font-weight: 600;
  list-style: none;
}

.day-block summary::-webkit-details-marker {
  display: none;
}

.day-block summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.5rem;
  transition: transform 0.15s ease;
}

.day-block[open] summary::before {
  transform: rotate(90deg);
}

.table-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  padding: 0.5rem 0.75rem;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

th:first-child, td:first-child {
  text-align: left;
}

thead th {
  color: var(--text-muted);
  font-weight: 600;
  background: var(--bg);
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 1rem 0;
}

.spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -0.15em;
  margin-right: 0.4em;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Accesibilidad ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 0.9rem;
  z-index: 10;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.field input[aria-invalid="true"] {
  border-color: var(--danger);
}

/* ---------- Banner API caída / pie ---------- */
.api-down-banner {
  padding: 0.6rem 1.5rem;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
}

.api-down-banner[hidden] {
  display: none;
}

.app-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* ---------- Formularios ---------- */
.form-extras {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.form-extras__status {
  color: var(--success);
  font-size: 0.8rem;
  word-break: break-all;
}

.link-btn {
  appearance: none;
  border: none;
  background: none;
  padding: 0;
  font: inherit;
  font-size: 0.8rem;
  color: var(--primary);
  text-decoration: underline;
  cursor: pointer;
}

.btn--small {
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
}

.error-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* ---------- AQI ---------- */
.aqi-badge {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.5;
}

.aqi-badge--compact {
  margin-top: 0;
  min-width: 2.4rem;
  text-align: center;
}

.aqi-badge--none {
  color: var(--text-muted);
}

.aqi-hero {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-bottom: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 6px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.aqi-hero__value {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 4.5rem;
  border-radius: 8px;
  font-size: 2rem;
  font-weight: 800;
}

.aqi-hero__level {
  font-size: 1.15rem;
  font-weight: 700;
}

.aqi-hero__advice {
  margin-top: 0.15rem;
  font-size: 0.9rem;
}

.aqi-hero__source {
  margin-top: 0.35rem;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.aqi-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.aqi-legend li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.aqi-legend__swatch {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 3px;
  border: 1px solid rgba(0, 0, 0, 0.2);
}

.results-note {
  margin: 0.6rem 0 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.results-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.results-actions {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

/* ---------- Tarjetas: delta y viento ---------- */
.stat-card__delta {
  margin-top: 0.35rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.stat-card__delta--up { color: var(--danger); }
.stat-card__delta--down { color: var(--success); }

.wind-arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

/* ---------- Lote ---------- */
.day-block summary .aqi-badge {
  margin-top: 0;
  margin-left: 0.6rem;
}

.summary-table td:first-child,
.summary-table th:first-child {
  font-weight: 600;
}

.row-critical td {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  font-weight: 600;
}

/* ---------- Skeletons de carga ---------- */
.skeleton {
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--border) 25%, var(--surface) 50%, var(--border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.2s linear infinite;
}

.skeleton--hero { height: 84px; margin-bottom: 0.75rem; }
.skeleton--card { height: 110px; }
.skeleton--block { height: 120px; margin-bottom: 0.75rem; }

@keyframes shimmer {
  to { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .skeleton, .spinner, .wind-arrow { animation: none; transition: none; }
}

/* ---------- Móvil: tablas como tarjetas ---------- */
@media (max-width: 640px) {
  .app-header, .tabs, .app-main, .app-footer, .api-down-banner { padding-left: 1rem; padding-right: 1rem; }

  .day-block table, .day-block thead, .day-block tbody, .day-block tr, .day-block td { display: block; }
  .day-block thead { position: absolute; left: -9999px; }
  .day-block tr { padding: 0.5rem 0; border-bottom: 2px solid var(--border); }
  .day-block td {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    border: none;
    padding: 0.25rem 0.75rem;
    white-space: normal;
  }
  .day-block td::before {
    content: attr(data-label);
    color: var(--text-muted);
    font-weight: 600;
  }
  .aqi-hero { flex-direction: column; }
  .aqi-hero__value { padding: 0.4rem 0; }
}

/* ---------- Impresión ---------- */
@media print {
  .no-print, .tabs, .app-header .health-badge, .api-down-banner, .skip-link,
  form.card, .form-extras, .link-btn { display: none !important; }
  body { background: #fff; color: #000; }
  .panel[hidden] { display: none !important; }
  .no-break, .day-block { break-inside: avoid; }
  .app-header { border: none; padding: 0 0 0.5rem; }
}

/* ---------- Gráficos semanales ---------- */
:root {
  --viz-grid: #e1e0d9;
  --viz-axis: #c3c2b7;
  --viz-muted: #6f6d68;
  --viz-band: rgba(31, 111, 92, 0.07);
  --viz-s1: #2a78d6;
  --viz-s2: #eb6834;
  --viz-s3: #1baf7a;
  --viz-s7: #6250d6;
  --viz-s8: #e34948;
}

@media (prefers-color-scheme: dark) {
  :root {
    --viz-grid: #2c2c2a;
    --viz-axis: #383835;
    --viz-muted: #a09e97;
    --viz-band: rgba(79, 183, 151, 0.1);
    --viz-s1: #3987e5;
    --viz-s2: #d95926;
    --viz-s3: #199e70;
    --viz-s7: #9085e9;
    --viz-s8: #e66767;
  }
}

.weekly {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.weekly__title {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

.chart-card {
  margin: 1rem 0 0;
  padding: 1rem 1rem 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 0;
}

.chart-card__title {
  margin: 0;
  font-size: 0.95rem;
}

.chart-card__subtitle {
  margin: 0.1rem 0 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0 1rem;
}

.chart-legend {
  display: flex;
  gap: 1rem;
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  font-size: 0.8rem;
  color: var(--text);
}

.chart-legend li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.chart-legend__key {
  width: 14px;
  height: 2px;
  border-radius: 1px;
}

.chart {
  position: relative;
  margin-top: 0.25rem;
}

.chart__svg {
  display: block;
  max-width: 100%;
  overflow: visible;
}

.chart__svg:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.chart__grid { stroke: var(--viz-grid); stroke-width: 1; }
.chart__axis { stroke: var(--viz-axis); stroke-width: 1; }
.chart__band { fill: var(--viz-band); }
.chart__tick { fill: var(--viz-muted); font-size: 11px; }
.chart__tick--strong { fill: var(--text); font-weight: 700; }
.chart__peak { fill: var(--text); font-size: 11px; font-weight: 700; }

.chart__line {
  fill: none;
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.chart__area { opacity: 0.1; stroke: none; }

.chart__dot { stroke: var(--surface); stroke-width: 2; }
.chart__crosshair { stroke: var(--viz-muted); stroke-width: 1; }
.chart__cursor { pointer-events: none; }

.chart__bar { outline: none; }
.chart__bar-fill { transition: filter 0.12s ease; }
.chart__bar.is-active .chart__bar-fill,
.chart__bar:hover .chart__bar-fill { filter: brightness(1.08) saturate(1.1); stroke: var(--text); stroke-width: 1.5; }
.chart__bar:focus-visible .chart__bar-fill { stroke: var(--primary); stroke-width: 2; }

.chart-tooltip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  min-width: 120px;
  padding: 0.45rem 0.65rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  font-size: 0.78rem;
  white-space: nowrap;
}

.chart-tooltip[hidden] { display: none; }
.chart-tooltip__title { color: var(--text-muted); margin-bottom: 0.2rem; }
.chart-tooltip__row { display: flex; align-items: center; gap: 0.4rem; }
.chart-tooltip__row strong { font-size: 0.9rem; }
.chart-tooltip__name { color: var(--text-muted); }
.chart-tooltip__key { width: 12px; height: 2px; border-radius: 1px; flex: none; }

.weekly .link-btn { margin-top: 1rem; display: inline-block; }
.weekly .table-wrap { margin-top: 0.5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }

@media print {
  .chart-tooltip { display: none !important; }
}